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Phosphorylated insulin like growth factor

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https://www.readbyqxmd.com/read/28614768/melanocortin-4-receptor-agonist-ro27-3225-ameliorates-soleus-but-not-gastrocnemius-atrophy-in-arthritic-rats
#1
A B Gomez-Sanmiguel, M P Nieto-Bona, C Fernandez-Galaz, T Priego, A I Martin, A Lopez-Calderon
Adjuvant-induced arthritis in rats decreases body weight and muscle mass. Melanocyte stimulating hormone administration to arthritic rats decreases inflammation and skeletal muscle wasting. In this study, we investigate whether activation of melanocortin-4 receptor by RO27-3225 administration is able to prevent the effect of arthritis on the expression of muscle-specific E3 ubiquitin ligases and MyoD in two different muscles, gastrocnemius (a mainly fast type muscle) and soleus (slow type). Arthritis was induced in male Wistar rats by intradermal injection of Freund's adjuvant...
April 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28611445/insulin-like-growth-factor-i-and-its-binding-protein-3-are-regulators-of-lactation-and-maternal-responsiveness
#2
András H Lékó, Melinda Cservenák, Éva Rebeka Szabó, János Hanics, Alán Alpár, Árpád Dobolyi
Adaptation to motherhood includes maternal behaviour and lactation during the postpartum period. The major organizing centres of maternal behaviour and lactation are located in the hypothalamic medial preoptic area (MPOA) and the arcuate nucleus, respectively. Insulin-like growth factor I (IGF-I) is an effector of the growth hormone axis; however, its function in the brain is largely unexplored. We identified increased maternal IGF binding protein-3 (IGFBP-3) expression in preoptic rat microarray data and confirmed it by RT-PCR...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28608366/complement-component-1-q-subcomponent-binding-protein-c1qbp-in-lipid-rafts-mediates-hepatic-metastasis-of-pancreatic-cancer-by-regulating-igf-1-igf-1r-signaling
#3
Haojun Shi, Winston Fang, Minda Liu, Deliang Fu
Pancreatic cancer shows a remarkable predilection for hepatic metastasis. Complement component 1, q subcomponent binding protein (C1QBP) can mediate growth factor-induced cancer cell chemotaxis and distant metastasis by activation of receptor tyrosine kinases. Coincidentally, insulin-like growth factor-1 (IGF-1) derived from the liver and cancer cells itself has been recognized as a critical inducer of hepatic metastasis. However, the mechanism underlying IGF-1-dependent hepatic metastasis of pancreatic cancer, in which C1QBP may be involved, remains unknown...
June 12, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28607354/igf-1-mediated-neurogenesis-involves-a-novel-rit1-akt-sox2-cascade
#4
Sajad Mir, Weikang Cai, Shaun W Carlson, Kathryn E Saatman, Douglas A Andres
Insulin-like growth factor 1 (IGF-1) is known to have diverse effects on brain structure and function, including the promotion of stem cell proliferation and neurogenesis in the adult dentate gyrus. However, the intracellular pathways downstream of the IGF-1 receptor that contribute to these diverse physiological actions remain relatively uncharacterized. Here, we demonstrate that the Ras-related GTPase, RIT1, plays a critical role in IGF-1-dependent neurogenesis. Studies in hippocampal neuronal precursor cells (HNPCs) demonstrate that IGF-1 stimulates a RIT1-dependent increase in Sox2 levels, resulting in pro-neural gene expression and increased cellular proliferation...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28595186/age-related-insulin-like-growth-factor-binding-protein-4-overexpression-inhibits-osteogenic-differentiation-of-rat-mesenchymal-stem-cells
#5
Jinhui Wu, Chao Wang, Xiong Miao, Yungang Wu, Jiabin Yuan, Muchen Ding, Jingfeng Li, Zhicai Shi
BACKGROUND/AIMS: Insulin-like growth factor binding proteins (IGFBP) play important roles in bone metabolism. IGFBP4 is involved in senescent-associated phenomena in mesenchymal stem cells (MSCs). The goal of the present study was to determine whether age-related IGFBP4 overexpression is associated with the impaired osteogenic differentiation potential of aged bone marrow derived MSCs. METHODS: MSCs were isolated from Sprague-Dawley rats aged 3-26 months. The bone morphogenetic protein (BMP)-2-induced osteogenic differentiation of rat MSCs was assessed by analyzing the expression levels of osteoblast marker genes [runt-related transcription factor 2 (RUNX2), alkaline phosphatase (ALP), and osteocalcin (OC)], ALP activity and calcification...
June 9, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28594135/the-igf-1-akt-s6-pathway-and-expressions-of-glycolytic-myosin-heavy-chain-isoforms-are-upregulated-in-chicken-skeletal-muscle-during-the-first-week-after-hatching
#6
Takaoki Saneyasu, Tatsuya Tsuchihashi, Ayana Kitashiro, Nami Tsuchii, Sayaka Kimura, Kazuhisa Honda, Hiroshi Kamisoyama
Skeletal muscle mass is an important trait in the animal industry. We previously reported an age-dependent downregulation of the insulin-like growth factor 1 (IGF-1)/Akt/S6 pathway, major protein synthesis pathway, in chicken breast muscle after 1 week of age, despite a continuous increase of breast muscle weight. Myosin heavy chain (HC), a major protein in muscle fiber, has several isoforms depending on chicken skeletal muscle types. HC I (fast-twitch glycolytic type) is known to be expressed in adult chicken breast muscle...
June 8, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28585197/human-protein-kinases-and-obesity
#7
Atilla Engin
The action of protein kinases and protein phosphatases is essential for multiple physiological responses. Each protein kinase displays its own unique substrate specificity, and a regulatory mechanism that may be modulated by association with other proteins. Protein kinases are classified by the target amino acid in their substrates. Some protein kinases can phosphorylate both serine/threonine, as well as tyrosine residues. This group of kinases has been known as dual specificity kinases. Unlike the dual specificity kinases, a heterogeneous group of protein phosphatases are known as dual-specificity phosphatases...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28583713/igf-1r-signalling-contributes-to-il-6-production-and-t-cell-dependent-inflammation-in-rheumatoid-arthritis
#8
Malin C Erlandsson, Sofia Töyrä Silfverswärd, Mitra Nadali, Minna Turkkila, Mattias N D Svensson, Ing-Marie Jonsson, Karin M E Andersson, Maria I Bokarewa
BACKGROUND: Signalling through insulin-like growth factor 1 receptor (IGF-1R) is essential for cell survival, but may turn pathogenic in uncontrolled tissue growth in tumours. In rheumatoid arthritis (RA), the IGF-1R signalling is activated and supports expansion of the inflamed synovia. AIM: In the present study, we assess if disruption of IGF-1R signalling resolves arthritis. MATERIAL AND METHODS: Clinical associations of IGF-1R expression in leukocytes of the peripheral blood were studied in 84 RA patients...
June 2, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28573188/a-hyper-crosslinked-carbohydrate-polymer-scaffold-facilitates-lineage-commitment-and-maintains-a-reserve-pool-of-proliferating-cardiovascular-progenitors
#9
Jonathan M Baio, Ryan C Walden, Tania I Fuentes, Charles C Lee, Nahidh W Hasaniya, Leonard L Bailey, Mary K Kearns-Jonker
BACKGROUND: Cardiovascular progenitor cells (CPCs) have been cultured on various scaffolds to resolve the challenge of cell retention after transplantation and to improve functional outcome after cell-based cardiac therapy. Previous studies have reported successful culture of fully differentiated cardiomyocytes on scaffolds of various types, and ongoing efforts are focused on optimizing the mix of cardiomyocytes and endothelial cells as well as on the identification of a source of progenitors capable of reversing cardiovascular damage...
May 2017: Transplantation Direct
https://www.readbyqxmd.com/read/28562144/the-behavioral-deficits-and-cognitive-impairment-are-correlated-with-decreased-igf-ii-and-erk-in-depressed-mice-induced-by-chronic-unpredictable-stress
#10
Ya Li, Yajing Chen, Xiaoxiao Gao, Zhongqiu Zhang
AIM: To investigate the behavioral deficits, cognitive impairment and possible mechanisms induced by chronic unpredictable stress (CUS) in mice of different ages. METHODS: The behaviors and cognition were tested using the open field test, tail suspension test and the Morris water maze. The changes in the insulin-like growth factor II (IGF-II) and the extracellular signal-regulated kinase (ERK) and phosphorylation (p-ERK) in the hippocampus (HP) and prefrontal cortex (PFC) were evaluated by immunohistochemistry...
June 18, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28560388/inhibition-of-igf-1-receptor-kinase-blocks-the-differentiation-into-cardiomyocyte-like-cells-of-bmscs-induced-by-igf-1
#11
Haibin Gong, Xiuli Wang, Lei Wang, Ying Liu, Jie Wang, Qian Lv, Hui Pang, Qinglin Zhang, Zhenquan Wang
Bone marrow mesenchymal stem cells (BMSCs) have the potential to transdifferentiate into cardiomyocyte‑like cells (CLCs) if an appropriate cardiac environment is provided. Insulin‑like growth factor‑1 (IGF‑1) plays an important role in the cell migration, survival and differentiation of BMSCs. However, the effect of IGF‑1 on the cellular differentiation remains unclear. In the present study, BMSCs were isolated from rat femurs and tibias and the cells were purified at passage 6 (P6). IGF‑1 and IGF‑1 receptor (IGF‑1R) kinase inhibitor I‑OMe AG538 were added to detect if IGF‑1 could induce BMSCs to transdifferentiate into CLCs and if I‑OMe AG538 could inhibit IGF‑1‑mediated receptor activation and downstream signaling...
July 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28551627/the-cooh-terminus-of-the-igf-1ec-isoform-enhances-the-proliferation-and-migration-of-human-mcf-7-breast-cancer-cells
#12
Panagiotis F Christopoulos, Efstathia Papageorgiou, Constantina Petraki, Michael Koutsilieris
BACKGROUND/AIM: The insulin-like growth factor-1 (IGF-1) signaling is well implicated in cancer biology, however the potential roles of the distinct IGF-1 isoforms in human malignancies are largely unknown. Recently, the carboxyl-terminal of the IGF-1Ec variant (hEc; 24aa) has been associated with osteosarcoma and prostate cancer. Herein, we investigated the potential role of hEc in breast cancer. MATERIALS AND METHODS: Synthetic hEc peptide was administrated to MCF-7 and MDA-MB-231 breast cancer cells...
June 2017: Anticancer Research
https://www.readbyqxmd.com/read/28544544/insulin-like-growth-factor-1-signaling-is-responsible-for-cathepsin-g-induced-aggregation-of-breast-cancer-mcf-7-cells
#13
Riyo Morimoto-Kamata, Satoru Yui
Cathepsin G (CG), a neutrophil serine protease, induces cell migration and multicellular aggregation of human breast cancer MCF-7 cells in a process that is dependent on E-cadherin and CG enzymatic activity. While these tumor cell aggregates can cause tumor emboli that could represent intravascular growth and extravasation into the surrounding tissues, resulting in metastasis, the molecular mechanism underlying this process remains poorly characterized. In this study, we aimed to identify the signaling pathway that is triggered during CG-mediated stimulation of cell aggregation...
May 24, 2017: Cancer Science
https://www.readbyqxmd.com/read/28533420/igf1-stimulates-greater-muscle-hypertrophy-in-the-absence-of-myostatin-in-male-mice
#14
Alexander Hennebry, Jenny M Oldham, Tea Shavlakadze, Miranda Grounds, Philip Sheard, Marta Fiorotto, Shelley J Falconer, Heather K Smith, Carole Berry, Ferenc Jeanplong, Jeremy Bracegirdle, Kenneth G Matthews, Gina Nicholas, Monica Senna-Salerno, Trevor Watson, Christopher D McMahon
Insulin-like growth factors (IGFs) and myostatin have opposing roles in regulating the growth and size of skeletal muscle, with IGF1 stimulating, and myostatin inhibiting, growth. However, it remains unclear whether these proteins have mutually dependent, or independent, roles. To clarify this issue, we crossed myostatin null (Mstn-/-) mice with mice over-expressing Igf1 in skeletal muscle (Igf1+) to generate six genotypes of male mice; wild-type (Mstn+/+), Mstn+/-, Mstn-/-, Mstn+/+:Igf1+, Mstn+/-:Igf1+ and Mstn-/-:Igf1+...
May 22, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28526921/glp-1-signalling-compensates-for-impaired-insulin-signalling-in-regulating-beta-cell-proliferation-in-%C3%AE-irko-mice
#15
Dan Kawamori, Jun Shirakawa, Chong Wee Liew, Jiang Hu, Tomoaki Morioka, Alokesh Duttaroy, Bryan Burkey, Rohit N Kulkarni
AIMS/HYPOTHESIS: We aimed to investigate potential interactions between insulin and glucagon-like peptide (GLP)-1 signalling pathways in the regulation of beta cell-cycle dynamics in vivo, in the context of the therapeutic potential of GLP-1 to modulate impaired beta cell function. METHODS: Beta cell-specific insulin receptor knockout (βIRKO) mice, which exhibit beta cell dysfunction and an age-dependent decrease in beta cell mass, were treated with the dipeptidyl peptidase-4 inhibitor vildagliptin...
May 20, 2017: Diabetologia
https://www.readbyqxmd.com/read/28521459/cisplatin-regulates-cell-autophagy-in-endometrial-cancer-cells-via-the-pi3k-akt-mtor-signalling-pathway
#16
Qiongyan Lin, Yifeng Wang, Dunjin Chen, Xiujie Sheng, Juan Liu, Hanzhen Xiong
Endometrial cancer is the most common gynaecological malignancy encountered in developed countries and the second most common in the developing world. The five-year survival rate of patients with endometrial cancer diagnosed at a late stage is <30%. Therefore, it is critical to develop a suitable chemotherapeutic regimen for late-stage endometrial cancer. Cisplatin (CDDP) is a first-line chemotherapeutic drug for endometrial cancer chemotherapy. The present study investigated the molecular mechanism underlying the effect of CDDP on endometrial cancer from the perspective of cell autophagy...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28520765/an-integrative-analysis-of-tissue-specific-transcriptomic-and-metabolomic-responses-to-short-term-dietary-methionine-restriction-in-mice
#17
Sujoy Ghosh, Laura A Forney, Desiree Wanders, Kirsten P Stone, Thomas W Gettys
Dietary methionine restriction (MR) produces a coordinated series of transcriptional responses in peripheral tissues that limit fat accretion, remodel lipid metabolism in liver and adipose tissue, and improve overall insulin sensitivity. Hepatic sensing of reduced methionine leads to induction and release of fibroblast growth factor 21 (FGF21), which acts centrally to increase sympathetic tone and activate thermogenesis in adipose tissue. FGF21 also has direct effects in adipose to enhance glucose uptake and oxidation...
2017: PloS One
https://www.readbyqxmd.com/read/28507717/dynamic-structural-and-thermodynamic-basis-of-insulin-like-growth-factor-1-kinase-allostery-mediated-by-activation-loop-phosphorylation
#18
Yaozong Li, Kwangho Nam
Despite the importance of kinases' catalytic activity regulation in cell signaling, detailed mechanisms underlying their activity regulation are poorly understood. Herein, using insulin-like growth factor 1 receptor kinase (IGF-1RK) as a model, the mechanisms of kinase regulation by its activation loop (A-loop) phosphorylation were investigated through molecular dynamics (MD) and alchemical free energy simulations. Analyses of the simulation results and free energy landscapes determined for the entire catalytic cycle of the kinase revealed that A-loop phosphorylation affects each step in the IGF-1RK catalytic cycle, including conformational change, substrate binding/product release and catalytic phosphoryl transfer...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28507342/effects-of-dietary-methionine-on-breast-muscle-growth-myogenic-gene-expression-and-igf-i-signaling-in-fast-and-slow-growing-broilers
#19
Chao Wen, Xueying Jiang, Liren Ding, Tian Wang, Yanmin Zhou
This study investigated the responses of fast- (FG) and slow- (SG) growing broilers to dietary methionine (Met) status. The broilers were subjected to low (LM, 0.38 and 0.28 g/100 g), adequate (AM, 0.51 and 0.42 g/100 g) and high (HM, 0.65 and 0.52 g/100 g) Met during 1-21 and 22-42 d, respectively. Compared with the LM diets, the AM and HM diets increased body weight gain only in the FG broilers. The HM diets increased breast muscle yield only in the FG broilers, although insulin-like growth factor-I (IGF-I) concentration was increased in both strains of broilers...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28497370/igf2bp1-a-novel-binding-protein-of-p38-mapk
#20
Jacob Rini, Moorthy Anbalagan
Signal transduction pathways control various biological processes in cells leading to distinct cellular functions. Protein-protein interactions and post-translational modifications are the physiological events that occur in signaling pathway. p38 MAPK are known to be involved in regulating wide range of cellular processes by interacting and activating relevant signaling molecules by means of phosphorylation. Deregulation of p38 MAPK is associated with various pathological conditions. In order to get an insight into the role played by p38 MAPK in cellular signaling, studies were carried out to identify proteins that interact with p38 MAPK...
May 11, 2017: Molecular and Cellular Biochemistry
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